## ΔU=0 in Isothermal Process

$\Delta U=q+w$

Hank Wang 2J
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

### ΔU=0 in Isothermal Process

I know this may sound simple but can someone explain to me why ΔU is equal to zero under conditions of constant temperature? Thanks!

Jonathan Shih 3H
Posts: 37
Joined: Fri Sep 25, 2015 3:00 am

### Re: ΔU=0 in Isothermal Process

As Dr. Lavelle addressed in class, looking at your question strictly mathematically, recall that delta U, change in internal energy, is also equal to 3/2nRdeltaT. So when the process is isothermal, indicating no change in T and therefore a delta T of 0, then essentially we have delta U=3/2nR(0), which equals to 0.